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<title>Debugging with GDB: Invoking GDB</title>
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<a name="Invoking-GDB"></a>
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<p>
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Next: <a href="Quitting-GDB.html#Quitting-GDB" accesskey="n" rel="next">Quitting GDB</a>, Up: <a href="Invocation.html#Invocation" accesskey="u" rel="up">Invocation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Invoking-GDB-1"></a>
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<h3 class="section">2.1 Invoking <small>GDB</small></h3>
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<p>Invoke <small>GDB</small> by running the program <code>gdb</code>. Once started,
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<small>GDB</small> reads commands from the terminal until you tell it to exit.
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</p>
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<p>You can also run <code>gdb</code> with a variety of arguments and options,
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to specify more of your debugging environment at the outset.
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</p>
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<p>The command-line options described here are designed
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to cover a variety of situations; in some environments, some of these
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options may effectively be unavailable.
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</p>
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<p>The most usual way to start <small>GDB</small> is with one argument,
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specifying an executable program:
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb <var>program</var>
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</pre></div>
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<p>You can also start with both an executable program and a core file
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specified:
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb <var>program</var> <var>core</var>
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</pre></div>
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<p>You can, instead, specify a process ID as a second argument or use option
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<code>-p</code>, if you want to debug a running process:
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb <var>program</var> 1234
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gdb -p 1234
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</pre></div>
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<p>would attach <small>GDB</small> to process <code>1234</code>. With option <samp>-p</samp> you
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can omit the <var>program</var> filename.
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</p>
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<p>Taking advantage of the second command-line argument requires a fairly
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complete operating system; when you use <small>GDB</small> as a remote
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debugger attached to a bare board, there may not be any notion of
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“process”, and there is often no way to get a core dump. <small>GDB</small>
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will warn you if it is unable to attach or to read core dumps.
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</p>
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<p>You can optionally have <code>gdb</code> pass any arguments after the
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executable file to the inferior using <code>--args</code>. This option stops
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option processing.
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</p><div class="smallexample">
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<pre class="smallexample">gdb --args gcc -O2 -c foo.c
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</pre></div>
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<p>This will cause <code>gdb</code> to debug <code>gcc</code>, and to set
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<code>gcc</code>’s command-line arguments (see <a href="Arguments.html#Arguments">Arguments</a>) to ‘<samp>-O2 -c foo.c</samp>’.
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</p>
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<p>You can run <code>gdb</code> without printing the front material, which describes
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<small>GDB</small>’s non-warranty, by specifying <code>--silent</code>
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(or <code>-q</code>/<code>--quiet</code>):
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb --silent
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</pre></div>
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<p>You can further control how <small>GDB</small> starts up by using command-line
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options. <small>GDB</small> itself can remind you of the options available.
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</p>
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<p>Type
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</p>
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<div class="smallexample">
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<pre class="smallexample">gdb -help
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</pre></div>
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<p>to display all available options and briefly describe their use
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(‘<samp>gdb -h</samp>’ is a shorter equivalent).
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</p>
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<p>All options and command line arguments you give are processed
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in sequential order. The order makes a difference when the
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‘<samp>-x</samp>’ option is used.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="File-Options.html#File-Options" accesskey="1">File Options</a>:</td><td> </td><td align="left" valign="top">Choosing files
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Mode-Options.html#Mode-Options" accesskey="2">Mode Options</a>:</td><td> </td><td align="left" valign="top">Choosing modes
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Startup.html#Startup" accesskey="3">Startup</a>:</td><td> </td><td align="left" valign="top">What <small>GDB</small> does during startup
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</td></tr>
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</table>
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<div class="header">
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<p>
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Next: <a href="Quitting-GDB.html#Quitting-GDB" accesskey="n" rel="next">Quitting GDB</a>, Up: <a href="Invocation.html#Invocation" accesskey="u" rel="up">Invocation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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